Air Purifiers come in two models, each with different levels of air-purification technology. The Premium Air Purifier features HEPA filtration that captures up to 99.97 percent of pollutants and pathogens that are 0.3 microns or larger. The Economy model comes with a MERV 13 filter, in line with ASHRAE's guidance for in-room air cleaners. All units also include two-stage filtration to bolster the purifier's ability to capture harmful particles without restricting airflow or efficiency.